Program in C construct pyramid of numbers

/* Write a C program to construct a pyramid of numbers. */

#include<stdio.h>

#include<conio.h>

void main()

{

            int num,i,y,x=35;

            clrscr();

            printf("\nEnter the number to generate the pyramid:\n");

            scanf("%d",&num);

            for(y=0;y<=num;y++)

            {

                        /*(x-coordinate,y-coordinate)*/

                        gotoxy(x,y+1);

                        /*for displaying digits towards the left and right of zero*/

                        for(i=0-y;i<=y;i++)

                                    printf("%3d",abs(i));

                        x=x-3;

            }

            getch();

}